The USAF Standard RLG INU Program

Jeremy Lewi

Abstract: The U.S. Air Force Standard RLG INU Program is the first commitment of an RLG-based militarized system to a production requirement. The Litton LN-93, which was fully qualified through all the U.S. Air Force conducted laboratory, flight, and environmental testing, was selected by the Air Force. It will shortly be delivered for application to several U.S. Air Force production programs. The requirements for this program evolved from the original Standard INU Specification, ENAC 77-1, into SNU 84-1. This later specification was developed by a series of government/industry meetings. The spec embraces all of the attributes of the original spec but added requirements of two kinds - one to meet new requirements, such as higher data rates and time tagging of data outputs; and, two, to take advantage of the inherent advantages of the new technology, such as higher reliability and insensitivity to mounting orientation. This system will provide, in a small lightweight package, nominal accuracies of 0.8 nm/hr and velocity accuracies of 2.5 ft/sec. Reaction time is better than 4 minutes for full gyrocompass alignment. All outputs are available on either of two MIL-STD-1553 data busses at data refresh rates up to 200 Hz. A MIL-STD-1750 computer is used with programming in MIL-STD-1589 (JOVIAL) Higher Order Language. The program represents the first time a military agency has selected two sources for production of an aircraft inertial system for application to multiple aircraft types. It presents a challenge to government and industry alike.
Published in: Proceedings of the 1986 National Technical Meeting of The Institute of Navigation
January 21 - 23, 1986
Long Beach, CA
Pages: 19 - 22
Cite this article: Lewi, Jeremy, "The USAF Standard RLG INU Program," Proceedings of the 1986 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 1986, pp. 19-22.
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